Zillow looked at single-family houses built from 1900 to 2014 to see which decades are most represented by the current housing stock. Turns out, many homes in the Northeastern states were built in the ’80s. But in California, the ’50s remain the dominant decade for homes still standing.

Washington, the nation’s capital, is holding strong as the area with the oldest decade — the 1920s — most represented today.

Knowing when the largest share of homes was built isn’t just a fun piece of trivia. It also provides a window into the character of real estate in your state. Check out some of the most popular styles through the decades.